A few of us bring our lunches and leave them at our desks as well. If they need refridgeration, then we put ice packs in the bag. Someone showed me a bag online (can't remember the website now, sorry) and you can put the bag in the freezer and it is supposed to keep you food cold for hours (if I remember correctly, it is for 12 hours). That may work as well. But I have had great luck with just using ice packs (i usually put 2 or 3 of the smaller ones in just to be sure.